Thanks for trying. In that case its likely somewhere else (plenty of
places but hard to find). :(
Regarding your question about safety: it should be relatively safe as
the change is also upstream and seems to address a corner case anyway.
If you want to be on the complete official side I think
I took the kernel version that currently is in updates (2.6.32-28.55) and added
the backport of the patch I was mentioning above. All the kernel packages are
at: http://people.canonical.com/~smb/lp710319/.
There are packages for all kinds of installations, so don't worry you will only
need to
I have just installed 2.6.32-28.
(still not rebooted)
I will do what you suggest later today. I hope I shouldn't go to my data
center after trying this :)
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Hi,
Thanks for taking care of this and preparing files, as well as manual
how to do it.
uname -a
Linux mail 2.6.32-28-server #55+lp710319v1 SMP Tue Feb 15 09:01:19 UTC 2011
x86_64 GNU/Linux
Apache CPU Usage after some threads die (e.g. after gracefull reload)
still is NOT correct.
Probably
Probably I can do that if it is not complicated a lot :) Please provide
me a test kernel and instructions what is the best/safest way to do the
test. Do you know maybe in which kernel that patch will be incorporated
to wait for it?
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@tinodj, were you using the test from the reply (the original test case
had a flaw)?
Anyway, the patch that Scot mentioned could be fixing things. But for
Lucid this was added in Ubuntu-2.6.32-25.44 and at least in the comment
a -24.43 kernel was used. So first question: is this still seen with a
@Stefan
Ooopsss ... I missed that point. I just tried the test from the reply, and
there is no output. So probably - there is no problem there.
My current kernel, once again is: 2.6.32-27
But the problem in apache persists.
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@tinodj, ok thanks for the confirmation here. Hm, would you be able to
install a test kernel on the host that exhibits the apache problem? That
was a production system, right? I would try to create a test kernel
based on 2.6.32-27 with just the patch added which I mentioned before.
That at least
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/710319
Title:
CPU usage is incorrect on server-status
I'm fairly sure that the bug that was reported here is due to a kernel bug
where utime can decrease.
http://kerneltrap.org/mailarchive/linux-kernel/2009/12/2/4514350
I've verified the test program shown in that thread reproduces on my lucid
system:
$ dpkg -S /boot/vmlinuz-$(uname -r)
Could you please verify that the linked test case shows the bug?
Download it to a file mytest.c, then 'gcc -o mytest mytest.c -lpthread' and
./mytest
** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
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Hi Scott,
Thank you for your time. I did what you suggest, and I've noticed two
strange things.
1. Compiling showed me the following warnings:
gcc -o mytest mytest.c -lpthread
mytest.c: In function ‘child’:
mytest.c:83: warning: format ‘%3d’ expects type ‘int’, but argument 4 has type
‘
Update:
Tried this script:
http://lkml.org/lkml/2009/11/3/522
Got this:
./mytest
utime decreased, was 1730, now 1577!
utime decreased, was 1754, now 1656!
uname -r
2.6.32-27-server
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